Using HTS voices with festival and speech-dispatcher

[Massimo]

Hello,

how can I use the HTS voices that come with the festival package on 
Gentoo? DefaultVoiceType "FEMALE1" doesn't point to these voices.
Generally I use these voices like this:

,----[ /etc/festival/siteinit.scm ]
|
| (set! voice_default 'voice_cmu_us_slt_arctic_hts)
|
`----

And this works for festival itself using (SayText).

Now for speech-dispatcher I tried this:

,----[ /etc/festival/siteinit.scm ]
|
| AddVoice "en" "female1" "voice_cmu_us_slt_arctic_hts"
|
`----

But festival modules log file says:

,----[ /var/log/speech-dispatcher/festival.log ]
|
| /etc/speech-dispatcher/modules//festival.conf:80:
|       Unknown Config-Option: 'AddVoice' 
|
`----

Regards,
Massimo